If my wife's T25 is anything to go by, you'll never stop spending money on it.
Stick with yer retro bikes, easy to work on, keep their value, easy to get spares, AREN'T FECKIN RUST BUCKETS, are faster than the campervan, don't need MOT'd. Oh and did I mention, they're not RUSTBUCKETS?
Having worked on my wife's one EVERY FECKIN YEAR to MOT it, I know that I'd not buy one through choice.
Lorna's one is fairly nippy with a 1.9l waterboxer but the brakes are shite but then you won't want to drive it that fast as it/they drink fuel. Sorry for the rant but I tried to tell my wife what would happen if she got one, she'd spend way more than she thought to keep it going/running. Welding because they're RUSTBUCKETS, terminally worn suspension components, brakes, every part is so old it's had it.
Unless you get one that's been in constant daily use instead of the 6 months in summer then RUSTING all winter, it'll require TLC to get/keep it running like your car. The non-use in winter allows things to seize up like disc calipers, hand-brakes, etc, that would normally work OK if kept in use.
Do you still want one?