Why does the ajpw chalk board have to be so expensive??

Today, we will be talking about the chalkboard that you can buy, in the School house party. But why is it so expensive? the chalkboard was released in the beta testing, and now is available to get in the School house party. Though... the chalkboard is very very expensive... It is 500 sapphires for each one you buy. Well, it was released in beta testing... so it would be expensive? I think the worth should be much, since alot of ppl can't get it, because of its price. before getting it, we might have to wait a while, so if the price changes into something lower in the future, it could be easier to get! once the chalkboard goes away (kinda like kami's frog) its rarity will become increased, but its mostly the jammers choice if they want it. For some reason, the chalkboard is more expensive then the price of membership (400 sapphires)!!! And Tbh, ajpw should change the price lower.