I am new here, also playing 45man 3.5$, in my eyes it is break-even spot, if BTN is raising here about ~25% hands. According to ICM this would be fold for you (88+ at least). On the other hand, this is very profitable call according to CHIP EV.
Personally I would fold here, as 3.5$ is a lot of fun players and there is often a great chance to get a payjump from their mistakes.