The coin you held isn't one of the coins with potential,  if your coin has been stale for years then you should try investing in new ones with great testimonies,  holding some alt-coins for years gives you a fortune years after.  Be smart,  start investing smartly.

Of course, hold these coins.  Now a very low price for btc.  And I do not advise you to sell all coins at once.

I think we have to distinguish two different conditions: trading or ICO investment:

For trading: I do not usually read the whitepaper at all - just looking at some trading parameters (chart/TA/Cap/Exchanges and so on...)

When I invest in ICO (which is quite rare) I do read the whitepaper, although not very in deepth. I just give it a glance in order to grasp a general idea how the project works. In fact, to understand in detail a WP you need to have very in-depth knowledge.

It’s also very important looking at the roadmap and seeing that they meet deadlines on releases of new features.

Yes I believe in them, I am joining bounty, I am investing in them and trading in the markets. They has give me a good income that I could never earn from real job. So I think this is a very good opportunity.

At ETH a huge number of advantages this technology, its popularity. I personally in this dispute support the ETH as the WAVES I dont like. Maybe I'll change my mind later.

Yes! Altcoins are cheaper than BTC.