The end of IPO is 10 MAY, BTT time?
And any explanation about >1btc category.
There are only two anon there, and the total amount is only 2.5btc.
I will be investing another BTC soon

Do I still have to pay the joining fee when I invest 1BTC?
If you invest 1 BTC in category 4, then you get the maximum coins possible, you don't need to join the free giveaway then. But other than that, yes, you would have!