I am leasing my license vBulletin 3.8.x I don't currently use it, it was bought a couple of years ago but now I don't run forums any more play WoW most of the time so I don't need it. I am willing to lease it for $20 a month the reason I am leasing and not selling is because the license has expired. I am willing to sell it expired but obviously you wouldn't be able to transfer the license into your details without paying a renewal fee which is just to high of a price but if anyone were interested I would sell it $40 outright. Steep yes but I need cash hence why I would much rather lease it than sell it. If anyone wanted to buy it without transferring it and renewing it and can trust that I wont scam them and take back the license you can have it for $40 but in this day and age I don't blame you for being cautious and not wanting to do this. So yea in short $20 p/m lease $40 outright buy.
You could lease a license from vBulletin before version 4 but you couldn't ever lease a license out. Also I may be wrong but I'm pretty sure you can't transfer an expired license.
That's what I'm saying I already stated you can't so I am selling for $30 with the option for the person to renew it so you get a discount instead of paying full price.
But the person can't renew it until they have it and they cant have it until it's renewed. The only way it could be done is the person would have to send you the money to renew and then hope that you would then transfer it to them. No offence meant but I can't see many people who would to be honest. Good luck though, I hope you do find someone.