$60k for two days at Lime Rock? Never driven it but looks like a relative snore. Given that and the draconian restrictions I’d try to get together with other groups who use it and force the price down. I doubt Grattan is that high but the $350 sounded about right to me unless turnout is reliably strong for the regional.
Lime Rock is hardly a snore. It is one of the most difficult tracks to race. It is at once technical and requires a willingness to commit at every turn not matched by too many other tracks. As for getting together with other groups, SCCA is lucky to get a date. I don't see other groups getting together much anywhere.