As a long time subscriber to playstation plus, I'm not terribly bothered. If + goes to upkeep now, and they maintain the weekly sales, bi-weekly free games, occassional free avatars, and all the rest of the neat perks, I feel it's worthy of support.
If, by chance, it helps with the planned reverse compatibility via streaming/Gaikai, it's another real reason to support it, IMO.
Sure, PCs don't charge you for something like plus, but the reliability of a console is a large bonus to me. So long as Sony balances the negatives like charging for online multiplayer with positives like numerous side perks, I'm happy.