10,000. Got me AGR bonuses and lounge access. Never had a chance to use an Amtrak lounge, but the reciprocal United Club access was nice and I used it once.
Theoretically 100 of these 100 minimum point segments was enough to make it to Select Plus. However, I had to think a lot between how much I was spending on my commute vs trying to score more TQPs. For instance, I could just get 10-ride tickets, but TQP accrual was only dependent on the price. Also - when that was a "live ticket", it didn't accrue (for the first day of the ticket validity) until the entire ticket was used, and accounting received the ticket to process. Later when it to eTickets for multi-ride, once the first use was recorded, it would then take a day or so for the TQPs to accrue. Something like RIC-SCC; I would usually just go EMY/BKY to GAC, but the cost was the same so it was better to just cover more stations. I think that was maybe $112, although a one-way BKY-GAC was $18. But the 10-ride was worth 224 points, and 10 single rides was worth 1000 points. In addition to that there were discounts to bring down the cost of single rides, and multi-city to double the points. Technically it could even triple or quadruple the points, but that took time, and I ran into issues because Capitol Corridor had limited trains to San Jose - about half ended at the Oakland Coliseum station.
I took advantage of as many discounts as I could, plus multi-city if I could combine that. There was often a supposed 25% off 49ers Levi's Stadium promotion for rides to/from GAC, but it was odd in that it wasn't just on game days and didn't have any advance purchase requirement. Also a 25% Oakland A's discount at OAC, where I'd combine rides with BART. Then split it up with a stop at FMT, where there was a cafe at the old SP Type 23 station building.
My wife wasn't too happy about it since I was getting up really early and sometimes coming home late trying to add a segment. She did like the one time that we used my Select Plus membership to get our family into a United Club. But apparently that benefit is gone. There was really no math to doing that. I just wanted it, and almost never used the benefits other than the points bonus.
However, at its most basic I could have theoretically just made 50 round trips between Berkeley and Emeryville for maybe $700. However, points runs for the sake of points runs seemed rather pointless if there wasn't more utility such as a commute or leisure travel.