This is besides the point but of course there's a number. You've never explored where that number is before? Of course, you're drinking some cheap shitty beer. It's an unlimited plan so you're not getting top shelf small batch IPA. It's some macro brew, let's say it's Budweiser. How many of those you think you can drink a day, every day, every month?
Lets say I charge you $300/month for "unlimited" Bud Light. No sharing with your friends, just all you can drink for $300. If retail is $1/beer, you'd only have to drink 10 beers/day for the deal to be worth it to you (every month only has 30 days to make the math easier), but let's say my costs are only .50's a beer because I'm buying in volume from a cheaper state, then you'd have to drink 20/day, or 600/month before I start losing money on the deal. Now remember, this is 20/day every day of the week for a month. Or 10/day on weekdays and 45 on Sat and Sun each, or almost 2/hr with no sleeping the whole weekend, every weekend.
Even if you think you can keep up that schedule, a bunch of your buddies joined as well. You think every one of them can also keep up? Because if someone wimps out and drinks 0 beers during the week, or skips any weekend, you've got to drink their portion in order for me to lose money on top of the 45 you're drinking a day. Anyway so you plug all that into a spreadsheet based on what you think you can get priced in volume after tax a state or two away, vs retail, and then figure out how many beers does a normal average person drink by themselves before they pass out.
Waddaya say? I'd feel bad if you die of cirrhosis but you did that to yourself.
ok, if we keep this analogue, i offer you **!!!! UNLIMITED !!!!** (vuvuzela noises here) beer for a month. however in the 67th page of my EULA i say, after you drank a gallon of beer this month, you have to use a really, i mean really really thin straw to drink beer for the rest of the month. done, sell me a bridge