To give you an example, some of the very low cost anti wrinkle skin creams are low cost for a reason. The ingredients in them are chemicals and artificial fragrances. This may not sound too bad but some of these cheap chemicals can cause irritation and skin rashes. As a worst case scenario, a very bad skin rash could be permanent. So you may not have wrinkles but you will be left with a permanent rash!
If you are used to going to a skin doctor or clinic to have your blackheads removed, consider doing them yourself. I know this may sound strange as you may not have time, though the hours wasted in getting yourself somewhere to have it done, can be saved. Doing it yourself is not a daily necessity and can be done in around five minutes. Simply put some hot water in the sink or in a bowl and place a towel over your head. Let the steam go all over your face for around five minutes and then exfoliate. You may not get all the blackheads in one go, but you will get a lot. The next time you do this you will most likely get them all.