I would highly recommend avoiding alt-coins. And it would not spread the risk to buy multiple alts since they are all based on the same technology. Want to diversify? Buy some bitcoin, gold, real estate, stocks, etc.
I am really surprised at the way people are turning down on altcoins and when I thought altcoins have actually invaded the whole space and clouded the mind of new investors. However, this coming from a very old investor in the community is not surprising anyway.
I totally agree with this as altcoins to me are just a waste of time, and if you think you are diversifying to avert some level of risk, altcoins are actually going to be increasing the level of risk eventually. I would rather be in bitcoin and look for other areas of investment outside cryptocurrency as well. Eth that would have even been a little bit of a good choice is inflationary.