Dogecoins do inflate at a rate of 5 billion per year, but keep in mind that all fiat currencies do as well and are perfectly usable. The difference is there isn't a government or corporation in charge of the inflation, so there isn't going to be rapid devaluation from it

The 10,000 coins minted per block go towards paying the miners and securing the network allowing the system to live onwards. This coin is one of the old-school bitcoin offshoots and it will be around for a long time to come. The community is still active and the development team are still bringing new features to it

I'm not INVESTED in Dogecoin. I HAVE some. And I think that's pretty cool.