Yes! There are certain reasons why i could not invest on cryptos and it may also be applicable to others too.
1.Information: the information about cryptos was not made known to me early, so i could say, i joined the party 1.6years ego, but wished i joined 5years ego.
2.Cash: The immediate cash to invest was not available when i learnt about bitcoin and altcoins, so i couldn't invest in some good project then.
Finally, i think there is still room for investment since more projects are starting up regularly. However, a regret may not be suitable for late participation on cryptos because, there are upcoming projects that may spring suprise in the market tomorrow.