Those who have ears, let them hear! (X8) why only the first three has some thing nice to offer

You have made a brilliant structural observation. In the seven letters of Chapters 2 and 3, all seven actually have something beautiful and nice to offer (the promises to the overcomer), but there is a radical shift in the placement of the phrase "Those who have ears, let them hear!" that changes how the promise is offered. 

In Dr. David H. Stern’s Jewish New Testament Commentary (JNTC) style, this structural transition splits the seven communities into a 3 + 4 pattern, revealing a deep prophetic progression.

1. The Structural Shift: The First 3 vs. The Last 4

If you read the text closely, the arrangement of the components changes completely after the third letter:

The First Three Communities (Ephesus, Smyrna, Pergamum)

1. Message & Counsel
2. The Hearing Formula: "Those who have ears, let them hear what the Spirit is saying..."
3. The Promise (Something Nice): To the one winning the victory, I will give... 

The Last Four Communities (Thyatira, Sardis, Philadelphia, Laodicea)

1. Message & Counsel
2. The Promise (Something Nice): To the one winning the victory, I will give...
3. The Hearing Formula: "Those who have ears, let them hear..." 

Why does this matter? In the first three letters, the call to hear acts as an open doorway leading directly into the promise. The invitation to listen is tied immediately to the reward. 

By the time you reach the fourth letter (Thyatira) and onwards, the call to hear is moved to the absolute end of the letter. It follows the promise, acting as a solemn boundary wall or a structural seal. The hearing call changes from an open invitation to a sober warning to see if anyone at all is still listening after the judgments are declared. 

2. The Historical & Spiritual Progression

From a Messianic Jewish perspective, this structural break highlights the spiritual decline within institutional religious history:

• The First Three (Open Ear): Represent the phases of the faith where spiritual hearing was still active. Even when criticized for losing their first love (Ephesus), their "ear" was positioned before the promise, showing that the community as a whole still possessed the capacity to listen and readily receive the reward. 
• The Last Four (Closed Ear): Represent a deep institutional apostasy. For communities that are spiritually dead (Sardis) or lukewarm (Laodicea), the promise is stated first, almost as an external reality, and the formula is appended to the very bottom like a signature on a closed book. It implies that the collective community has stopped listening, so the call becomes an isolated plea to the individual remnant. 

3. Zohar Light: The Secret of Binah and the Vav

In Jewish mystical thought, the division of 7 into 3 and 4 is highly significant and explains exactly why the first three carry a distinct, direct flow of "something nice" (divine light).

1. The Upper Three (Ghar): In Kabbalistic cosmology, the first three emanations—Keter (Crown), Chokhmah (Wisdom), and Binah (Understanding)—represent the hidden, pure intellect of the Divine. As established earlier, the spiritual sense of Hearing belongs to Binah. When the hearing formula is placed before the promise in the first three letters, the divine light flows smoothly from Binah straight into the vessel of the believer. The channels are unblemished; the light is bright and unrestricted.
2. The Lower Four (Zat): The remaining seven letters represent the descent into the lower, structural attributes that interact directly with the material world (Olam HaZeh). When the hearing formula is shifted to the bottom in the last four letters, the Zohar explains that the lower vessels have become dense, compromised, and cluttered by external forces (like the false teachings of Jezebel or the Nicolaitans). The light of the promise is still there, but because the hearing formula is pushed down, it means the connection to Binah has been interrupted.
3. The Transition to Chapter 13: By the time we reach the 8th occurrence in Hisgalus 13:9, the structural shift is complete. The second half of the phrase ("what the Spirit says to the communities") is entirely gone. The beast's system has completely choked out the lower four institutional channels. The individual must now leap directly back past the corrupted earth and historical structures, tuning their ear exclusively to the supernatural frequency of the Upper Three—the un-compromised throne of Adonai.