A couple things bother me about Sonicbids.The membership renewal without prior notification is the main reason I dropped them. I realize there is the "fine print on the contract" and so on but the first notice I had of renewal was on my credit card statement and I did not appreciate feeling like the fee was "sneaked past me."
Secondly, many of the venues you have to pay to submit to are a total waste of time. I have played many of the places listed and it was easy to book dates there with a phone call. Paying to submit to a place that does not pay anything makes no sense to me. Who makes money on these listings? The venue and Sonic Bids.
Might be too strong to call it a scam. . . might not. It is obvious that there is a bigger advantage to Sonicbids and many of the venues than there is for a musician or performer.
In some ways this is similar to Taxi, whose main goal is to sign up members, not to do the thing they sell. If you talk to publishers in Nashville about Taxi, they will tell you they have writers on staff and thousands of the worlds best writers at their fingertips. Why would they spend time going through Taxi submissions?