having a low market cap is not the reason why trading those tokens is a bad idea. the fact that they are purely pump and dump coins makes trading them a bad idea specially for a newbie who is not yet familiar with trading or with the market itself.
otherwise if these coins weren't 100% manipulated they could have been good choices. but now you only have to know how to go around pumpers and make your profit before they cash out (aka dump) otherwise you get stuck.
Basically new traders have fear about trading during the pumping time. Its because they think that its already climbed up a lot and now its gonna crash down rapidly where in most of the cases they lose the chance by this way. Yeah its true that nowadays coin price manipulated by a group of traders or investors. So its pretty much tough to predict about a coin price. In that situation its really important to be updated about the pumping trade.
There was a time when coin manipulation wasn't a common thing on the field of crypto trading but currently its been a daily Incident for Worldwide traders. For this reason many new traders lose their fund for lack of experience and manipulation is also convicted for that.