Well, this was revived so... And I'm having some free/dead time now, so....
Spoilers ahead:
You don't lose your stats, you're submerged in a fake reality, something like a Matrix. The monster and you "died" but surprise, you didn't.
The monster, stronger than you created that reality were you're trapped, because, as you stated, you can reboot, but only when you die, so he can't really kill you.
That's why your stats are zero at the very begining. MC didn't reboot, the big ugly monster tweeked his reality to make you think you're powerless. It's a porn game plot twist, don't expect nothing that deep or logic.
It's okay if you hate Amelie and Trianna, there are +17 girls to pick from, none of them forced. (well, they are not all done yet, but we're getting there.)
Now the money earning rate 18? not sure where you got that number, but no, you can work in several ways, and they will pay between 50 a 400. Training a stat cost 50 and it has like 85% success up to lvl 7 or something, so, if you work like 3 days, upgrade a stat a bit, and then work 10 days, you should have the money covered for the entire game. And then, this game has no time limit so, you don't need to hurry or worry.