this has probably been mentioned before but i think one key to getting a lot of offers is to answer the surveys in such a way that various advertisers will want to send you their ads. for example, if you answer the quick questions at the end of an offer by saying that no i'm not planning on moving in the next 6 months, nor getting married, nor graduating from college, nor opening a savings account, nor driving a rental car in a foreign country etc - you've just eliminated yourself from the possibility of a lot of offers.

i personally don't give a hoot about answering those type of questions honestly and end up just going with whatever i feel will get me more surveys. works pretty well.