Well, I guess I'm one of those you're referring to, investing even the bitcoin goes high or low. Only few people are getting success on that kind of mindset, they thought it's a stepping stone for getting rich but the reality is, it's not that easy like now. People are expecting another ATH or price pump but it still on $9k, It can't even resist the $10k and we need to wait for more months.
Being happy is already common especially those who invested a lot last year and waited for this bitcoin halving thingy. The majority of investors of bitcoin wanted to have a price pump, those who are unhappy, they did not grab the opportunity to invest at a low price.
From what I've seen, most people are into Bitcoin in order to make money instead of understanding its purpose in the mainstream world. As long as they can sell BTC for profit, nothing else matters. A very small portion of people actually care about using and understanding Bitcoin more thoroughly. Considering that human greed is unavoidable, we'll always see some people getting hyped when prices go all the way to the moon. When Bitcoin is facing "troubled times", you'll see most people whining because they've got into Bitcoin at higher prices. On the other side, there are buyers waiting for Bitcoin to go down the drain in order to obtain coins at a discount.
Personally, I wouldn't worry about price per coin on the market as long as Bitcoin works as intended. We will always have naysayers and long-term supporters of Bitcoin in crypto land. The more people buy Bitcoin, the higher the price per coin will be on the market. The same thing happens vice versa when more people sell their Bitcoin on the market. Some people will be happy about prices going up, while others won't. It's impossible to make all people happy regardless of market conditions (whenever good or bad). As long as you play your cards right, you'll be able to buy low and sell high. Only then, the effects of prices going up or down will have little to no effect over your mood. Same as you, I didn't grab the opportunity to invest at 2014's low prices. At least, it's better late than never. Just my thoughts