Many forum members have tried to help you and/or provided detailed calcutions for you showing no savings with your strategy. I'll try one more time:
1. Cost of renting 160 points at $12 = $1,920, at $13 = $2,080
2. Buying 160 points would cost $1,008 (160*$6.30) in MF (in the first year and more in the second year) plus your estimated finance costs which you now estimate at $750/year for two years. That puts you at $1,758. You then have to add the purchase price of your points which adds about another $2 per point or $320 ($2*160). That now puts your total at $2,078 and is now a wash or costing you more and you still need to account for the opportunity cost of the time value of money. Where is your savings???????
If you remove the financing fees from your equation, you MIGHT be able to get ahead if you execute all other variables of buying the contract correctly. That's why it is being suggested that you rent, stay at a value/offsite, or don't vacation at all for the next two years until you can purchase the contract without $1,500 in financing fees (over two years) which will minimize your risks and provide the most savings IF that is your goal. If savings is not your goal and you just want to purchase a contract without taking the costs into consideration, then by all means, finance and spend as much as you want......just don't proclaim you're saving anything by going that route.