Are sites like wordlinx a good place to advertise a referral link?

Depends on the site your putting in. PTC's work very well when advertising in a PTC (wordlinx). If you are trying to promote Gomez, I don't know how well that would go as it takes time to read about it, understand it.

And, of course, most people don't even read the PTC ads?

Well, I do, . But only if theres quick hard facts on the homepage. Get Paid 1$ per link. or something, grabs my attention.

Linkgrand worked for me better. I've advertised there twice and both the times I made sales. (I promoted an affiliate product which costed $80)

The one line ad should be catchy there to grab the attention. Instead of buying bold link, buy a 30 second timer.

Paid to reads are better for advertising referral links in my opinion.