Everyone does not have the budget required to buy mining equipment. There are also a number of monthly expense involved like electricity bills and thus investing is better in my opinion.
Building mining righ need a lot money and need understand about technical hardware to optimizing getting coin. I am choosing buying coin on exchanger and hold it because its more simple and because i am not understand about technology or hardware
you dont need to build a mining rig or buy the most expensive mining hardware to be able to start mining because as far as i know we can now use our devices and gadgets to mine coins as long as they have the function to conect thru the internet. Nowadays browser mining is now verry popular and it is the way of mining coins using only your devices browser. now thats what you call a cheap way of mining that wont cost you hundreds or thousands of dollars for any other expenses.
but the only down side is. browser mining tends to work slower or low end devices and it will still depend on the device operating hardware but overall it is still a good alternative if you are out of budget.