Charging $100 to visit Mirai seems steep, but my local Chicago Botanic Garden is $30 for non member vehicles purchased at the gate. ($ 8 online for autos in advance). So entry fees to gardens is the norm lately.
I occasionally worked helping a wholesale orchid grower with the odd retail event, and occasional wholesale. It was funny, I could wrangle a $5000 or more wholesale sale in less time than it would take to sell a retail $20 orchid. It seemed for the $20 orchid, the "little old lady" wanted a piece of your soul too. For the $5000 sale, the customer was clear on what they wanted, it was mostly logistics, where they needed to back their van up to to pick up the trays of plants. Load them up and get them back on the road.
Given the extra "touch" required by retail sales, especially the extra time a novice would require, the visitor fee serves 2 purposes, eliminates majority of time consuming sales to novice hobby growers, and identifies the small group of growers that view $100 as "chump change", thus identifying them as being part of the higher income bracket that will paid the "Mirai price mark up" without viewing it as onerous.
Mirai is good for the rest of the Bonsai retailers, as long as they keep their prices a little cheaper than Mirai, they can increase their prices to cover recent inflation. Everybody makes money, and Ryan takes the hit for benchmarking prices. Win, win.