SVO can work well. Unfortunately:
1) Since the ability to trade internally doesn't transfer upon resale purchase, you'd have to buy from the developer in order to trade within SVN. You'll pay thousands, perhaps tens of thousands, of dollars more for your unit in order to get the privilege of using the network.
2) SBP is a second-tier resort. I'm not talking quality (as I have no idea what the quality is) but in terms of StarOptions. Depending on what season, and how many bedrooms you buy, the MOST SOs you'll get, 125,000 for a 3 bdrm platinum season in the Palmetto phase, will not get you into a 2 bdrm during platinum season in any of the Tier 1 resorts. I strongly encourage you to look at the StarOption chart linked in the Owners Resource sticky above to explore what you could do with your SOs.
3) MFs are on the rise. SBP owners were recently hit with a significant increase in MFs. I have no idea what rentals go for in Myrtle Beach, but I'd definitely check out Redweek or even Tug classifieds to see what the going rate is for rentals. If rentals are not SIGNIFICANTLY more than rentals, then there's no way I'd buy there. Because Starwood can, and will, raise MFs to the point where it'll be very difficult for you to unload your property should you want to sell.
My best advice is that if you LOVE the property and want to go there year after year, then you might consider buying a villa on the resale market with the intention of using it year after year. If you buy during the platinum season, you might very well be able to use II to get better trades using II than using SVN.
If you love Myrtle Beach, I'd also steer you towards Marriott's TS there. It's right on the beach, it's resale value has held firm, and there are way more Marriott TSs to exchange to should you want to travel.
Hope this helps!