Dude you pay an XYZ tax buying from every XYZ store. If you follow Captain Cucumber's guide to growing cucumbers you get the same results as paying the "grocery store tax", but cucumber seeds are a fraction of the cost. However, the Time Tax is quite high.
For you, instead of paying the "reef store" store tax, you pay the Rock's Reef's Time Tax. For me, the tax on my time to do it myself is higher than the reef store tax, so I prefer to pay the reef store tax.
Some people have more money than time. Some people have dramatically more time than money. Either way, don't degrade a profitable business the provides a service people are willing to pay for.