Earlier quoted context omitted.
It's good that you don't mind being poor, 'cause that's what you're gonna be. I hope that start-up is worth it.
Good bunch of guys, and they're helping me add backend development to my skillset. That's how I look at it. Don't care much for equity.
I made very nearly that as a fresh graduate with an unremarkable degree and no relevant experience. Out in the sticks with more reasonable living expenses. Thirteen years ago, and I'd come close on several better paying positions. (Tip BTW, £400/mo after rent won't be enough for independent living.)
You're letting loyalty cloud your judgement; you can do better for yourself. Counting pennies isn't fun and you don't need to.