If you haven't heard about it, read this and if you decide to invest your money
Oh, BTW, that $150 gets you 100 icons for life!
ETA: If you already have a paid account and decide to indulge, you can transfer your remaining paid time to any other account, whether it is yours, someone else's or a community. Don't let it go to waste! ;)
ETA2: You don't need to buy the permanent account to get 100 icons! There are plans in the works to provide the option of 100 icons to paid users, at a price of course, but certainly not $150! *g*
ETA3: Also, if you had already bought extra icon space, you can transfer it by sending an email to firstname.lastname@example.org. Make sure to include your username and the username you want it transferred to.