The price was about 10 sats before Polo added Sia. It is not really a hard dump. It is just not raising up as we expected with the new exchange and new client and a planed marketing campaign which is on hold now and has not started yet. I think it might have something to do with the new 0.4.0 client which did not meet the expectation. With a better client (UI client as well) and a marketing campaign, we should get some new users and see better price.