I believe brokers have the right to halt trading f

I believe brokers have the right to halt trading for whatever companies they want, and you are right that it's possible that those with multi-million-dollar Fidelity accounts likely have access to BLTA if they want it. My friend's uncle has about $1.8 million in his Etrade account, and he gets the most ridiculous perks. Frequent dividends (just for maintaining his account balance), free trading (he's not a PDT either), 24/7 access to customer service, etc. And he can buy/sell whatever he wants. It's not a formal arrangement between the client and broker, just one of those "we want to make sure you stay with us" sort of things...so yes, there is a significant chance that Fidelity will allow large account holders to buy BLTA if the client suggest that he/she may consider switching brokers.