Too much or excess is bad depends on the specific thing that you are talking about, what I mean is that it's not everything that the principle applies to, there are some things that too much or excess of it is good and benefitial. When it comes to Bitcoin investment I don't think that the principle of over investing comes to play, investors should accumulate as much as they can for many years, that is the essence of long term hodling. Most of us that do DCA method is so we can stash our bags with excessive Bitcoin that will give us excessive profits to enjoy in our retirements. It is only in Bitcoin trading that the rule of excess of everything is bad because trading is risky, you can lose your funds if your trade goes against you but there is no risk in Bitcoin investment if you are on it for the long term.

Where emphasy should be on Bitcoin investment is to understand financial management, if you make budget for your expenses and allocate funds from your discretionary funds into Bitcoin investment, you won't have a problem. Depending on your needs and expenses you can allocate a sizable amount for your Bitcoin accumulation or not. The question of whether you are buying in excess doesn't arise because the amount is within your budget, you cannot over buy Bitcoin, the more you have it the more profitable it will become for you in the future. Take for instant the institutional investors, they keep buying despite their enormous stash, we as retail investors can do the same, so far it is amount that we can afford.