No one gets ripped off. Sure it can be obtained cheaper... and I am sure the quality is better in some cases. But this site is for Med users and who'm ever owns it is doing many many people, some who can't even leave their house, a great favor.
Its fair to assume this persons whole operation cost more than just the cost of the product.
If you can get it cheaper then why not... but if you can't.... and you need it... or its dry and you need it... then why not?