Well here I go again (3rd try) at posting this. First one got lost in cyber space. Second one, I thought I'd get smart and draft in an Android notepad app but lost it too (never used it before) and managed to wipe it out also. So, Evernote to the rescue.
Lots of variables with keeping our machines on the road. What is your financial condition? Five hundred bucks to a gainfully employed person may be doable but one on a fixed income may have to park it until the tooth fairy comes.
What is your skillset or do you have a buddy that's a good wrench on bikes? My drive belt broke on my Burgman 650 that would normally cost 3k to replace by dealer but a buddy who did his own, helped me do for 500. The more you can do the cheaper these cost to keep running.
What is your personal/emotional attachment? Are you restoring Dad's antique Honda you rode with him? Is this a classic, one of a kind bike or do you have allot into it with farkles and customization?
I have to say it though, modern scooters are amazing as some like me exceeded 100k on my Burgman and sold it and is still on the road today. A gentleman, who rides from Florida to Alaska every year as a charity run for the hearing challenged, rode his Honda Silverwing every year until he hit 150k and sold it and is still being ridden today. Don't discount these scoots too soon, they're nearly immortal.