If I'm going to commit $20,000+ on something, I'm going to use super conservative assumptions to be certain.
I used rack rate for a standard Resort View hotel room versus a Deluxe Studio and added on the cost of daily housekeeping. I assumed a 30% discount off of rack rate, 4% annual inflation on both dues and cash prices, and 10% return on cash.
Beach Club came out roughly break-even in that model but I was using a purchase price of $140 per point. If you're finding them for $115, that's fantastic.
Regardless, I think the more relevant question is "which
DVC contract will yield the MOST value" rather than whether a particular contract clears break-even. I think Beach Club fans tend to get tunnel vision in this regard.