They see what you don't see...
You are most likely not familiar with all the legal documentation involved in buying or selling a property and it is very important to be fully aware of the importance of understanding every point of the agreement, regardless of whether you are the buyer or the seller.
Real estate purchase contracts can have more than 14 pages of clauses and obligations, and a long series of local, state and federal legal documents.
In addition, if you are a foreigner buying in a restricted zone in Mexico, you will need to hire a trust, which adds another set of very important contracts and documents that you should be aware of.
This is where the participation of a real estate agent is as important as, if not more so, in the negotiation, since we are much more familiar with all these procedures and documents. Keep in mind that, a mistake in some contract, management or document, can be as expensive as that commission you did not want to pay, or even much more.