They do list a great price of $419.99 for the Weston Pro-2300, but the Weston Pro-3000 is $50.00 over normal price.
I have resealed potato chip bags and large bulk spice bags with the Weston as you have.
You are correct the marketing for some sealers is geared toward recurring sales of sealing bags. They make much more from sales of the bags than the machine. They lead you to believe that you save money by purchasing their bags on sale, but they won't tell you that other bags of the same size are compatible with the sealer.
If you compare the prices of the bags on the page above you referenced to FoodSaver prices, yes you save money even when FoodSaver has their big sales. But if you compare to the micro-channel bags like Weston and Vac-Master there isn't a savings.
Standard Vac-Master bags and Weston bags are safe for boiling.
On the page you listed;
standard 8 X 10 bags are $15.00 per 100
boilable 8 X 10 bags (just a hair over a pint) are $25.00 per 100
http://www.dougcare.com/foodstorage/homebags.htm
where as Vac-Master (boilable) (6 X 10 pint) are $11.28 per 100 and (8 X 12 quart) are $16.22 per 100.
http://www.equippers.com/food-packaging-machines/10048.asp
Weston Bags cost a little more because they are two-ply bags giving better strength in all directions. I didn't reference them because you were comparing cheaper single ply bags in your link.
Now if you could use the micro-channel bags in your snorkel sealer you have the best of both worlds.