Because these are pre-built solutions, we of course can't allow someone to simply buy it once and start selling and distributing it as their own immediately after.
You can create add ons and derivitive works, but since it is essentially different in that it requires no work or added intellectual input by the end user, it must have different license terms.
The solutions are designed for people to use on their web sites, they are not intended for web shops to use and resell at their convenience. That would undercut our ability to make them in the first place since we would have to compete with anyone who purchased it who could sell it for any price without a license preventing that. If you want to resell them, you would have to buy a copy per domain you end up pushing live.