It seems many people are speculating the rise of BTC and therefore are transfering value from alts to BTC. But if you want BTC, buy it with FIAT! Fresh new funds are needed on the market! You are dumping alts making prices dump hard and maybe are speculating you will be able to buy more of the alts later on, but what idiot will selll it to you at that dumped price?? So if you want BTC, buy it with FIAT or at least don't expect to buy back more of the alts for cheap!
Personally, I decided that I would buy Bitcoin for Fiat only if it drops to $ 5000. Otherwise, I will trade what I have and wait for good prices. I'd rather miss the possible benefits, than I'll regret that I bought for expensive.