The Sia-UI folder contains more than just the blockchain. For me it is 7.4 GB because I am also uploading a lot and my wallet file is large (old wallet with thousands of addresses). On a fresh install this is going to be way smaller. The 7 GB on your PC sounds about right.
Originally I think I was hosting 12 contracts and then each time I close and open the application, the indication of the # of contracts keeps going up by that number. But I think the hosting of those original contracts is still valid. Not sure if this answers your question.
Let see the options Mining VS investing in this early stage of the project.
build. 3 rigs with 5 gpus = $6000
buying $ 6000 in siacoins = 400,000 coins.
mining siacoins 400,000 with the 3 rigs 6 months.
the only advantage is if you build the rigs, then you can do dual mining lets say: Ethereum + siacoins = you'll be making about 25 Ethereums in 6 monts. the ethereums will pay for the equipment and you get 400,000 siacoins free. NICE.
I have just updated the blog post to reflect a change to the API - 'minimumXXX' is now 'minXXX'. These commands were changed when we upgraded to v1.0.0, but the blog post was never updated to reflect that.
minuploadbandwidthprice, minstorageprice, and mindownloadbandwidthprice are now the correct settings.