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!
This is good advice in order to avoid alt price from falling. But how many of us can even afford to purchase BTC with fiat? I'd say a significant few. Not many of us here have the cash to invest into BTC. But there are many of us who can afford to convert alts to BTC. This is an option that traders usually choose over cash investment because it is more practical in their minds. Practical in a sense to reduce risk.