... but can't find about this in terms. I have 60.000 files on server right now. Is it true about this limit?
I've heard that they don't have a set limit, but that they do terminate accounts that start to have too many (I'm assuming in the hundred thousands, no clue which ones). Send in a ticket, maybe they can answer this for you directly. I'm assuming they take it as a case-by-case basis though.
You might want to look at this persons experience with Bluehost in this thread at webhostingtalk about dealing with the 50,000 file limit.