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Quite simply, is paying for a paid submission paying for something that I've already got, a site in the FAST index?
Paying Fast for inclusion and reindexing every 48 hours is NOT going to give you better rankings. Period.
The PFI programme is only meant to give you the opportunity to get your pages in there fast and make sure they're staying there.
Wether waiting a while and getting in for free or caughing up the $ to get in fast will turn out profittable for you, I can't say. It will be a matter of ROI.
And, NO they will not throw you out after a few months - asuming that your site stays crawlable.
For some sites we pay - for others we don't. It all depends on content and the nature of the site.