They seem determined to kill their site - other trackers suffer from the power mad geek effect but BCG is the worst by miles;
- Idiotic logon procedure that adds no security
- Dozens of user classes
- Loads of silly metrics to advance in said classes
- Requirement that you seed everything for months
- Stupid referral system where you risk being banned if your invitees break their Byzantine rules
- Utterly pointless insistence on multi-rarred uploads
- Unreliable custom codebase presumably written by 14 year olds
- Critical features perpetualy "going to be ready next month"
- Uploads restricted to "uploader" class, who must upload every day to keep status
Might just be excusable if it resulted in good torrents but it doesn't. Loads are un or poorly seeded, mainly because they've lost half their userbase. Rare stuff often isn't there at all. Tracker of last resort for me these days.
Sorry for the rant, to answer your question, invites are only being given out to uploaders as far as I can tell, so you're probably SOL