In 2019 BLT and SSR's MFs were $6.40/pt so $3,923.20 for 613 points. Most WDW DVC MFs are higher.
Most people who stay at DVC at WDW as part of a large group book multiple 2BRs or many multiple studios because of the price/occupant. Obviously, YMMV.
If you rented from David's or DVC-rental that stay would be $12,260-$13,486 ($20-22/pt). Personally, I would not recommend renting if you want more than one room and/or want a specific 'hard to get' reservation (e.g. Theme park view over Christmas or Standard view during the 1st two weeks of December). Again, YMMV.
However, renting at a few different resorts for shorter stays to 'try out' DVC before committing might be a good idea. That said, we made our first DVC purchase after paying 'cash' for a DVC 2BR but bought 'sort of' sight unseen - we had stayed at the Beach Club but not the DVC building before buying BCV and at the Contemporary before buying BLT.