Don't come here to buy stuff
I second what is said under "Aggressive sales people". The shopkeepers have ruimed it for themselves as far as I'm concerned. Besides, there's nothing there you couldn't find in Old Sana'a for less.
Fun Alternatives: Go see the town, or skip it and see Hababah (see there). Go to the souq area of Old Sana'a for your jambiyas, shawls or whatever takes your fancy.
If there is a tourist trap in Thila is the salespeople and their shops... selling everything you may need as a souvenir - not necessarily Yemeni-made. We had read about it but we had not expect the people using such aggressive sales techniques... disappointing.
At first we had been fooled... the village seemed deserted and we had it all to ourselves... heavenly - until someone spotted us... the closed doors, which looked like small storage niches, opened up and a long row of shops appeared, together with their owners and friends (read: touts).
Fun Alternatives: Just a word of warning... if you see something you like and enter one particular shop, then you will have everyone else push you to go to their shop. So think twice before you buy something. They don't take a polite no as an answer too easily. Walk away and they will follow you. We had one particular guy following us for half an hour - bugging us.
To his credit, once he at last understood that we were not going to buy anything (after the famous endless 30 minutes), we had a nice chat and cracked a few jokes... and he turned out to be a much pleasanter person.