Well, yeah we are doing the same here DCA for me is safer though I only have few portions of Bitcoins weekly through a sig campaign but still it is what it is for investment purposes. No matter how small or big our investment is it does not matter and what is important here is that we got Bitcoins to hold for years.
The main thing which matters a lot is the initiation of bitcoin investment so if you are able to buy bitcoin at weekly, or monthly basis then you are lucky and as you are earning money through signature Campaign and use it for bitcoin investment then it will make you a wealthy person one day because from your goals and hardwork it seems that you are handling all the things very well.
DCA method for buying bitcoin is one of the safe and profitable way and every person who wants to become bitcoin holder should adopt this technology. No one can buy whole bitcoin therefore if someone has little savings throughout the week or month then this saving can be used for investment if a person has firm believe on bitcoin investment.