According to your post type only those who sign this forum only invest in bitcoin?.
You may be earning bitcoins weekly from this forum. But those who have other investors how will they invest?
The basic idea of the DCA method is to store bitcoins in small amounts over a long period of time. The more bitcoins an investor can purchase on a regular monthly or weekly basis, the longer his investment will last. Many people are hoarding bitcoins from a weekly source of income and will invest in bitcoins according to their income.
I think not everyone on this forum invests in Bitcoin. But it is a place from which there is much to know and understand. Must understand before starting any business and this one of the best platform where we learning about BTC and trading BTC.
On the other hand Some may have portfolios in the stock market, others cryptocurrency, bonds, real estate, or other jobs. From there we can share the experience on this forum. Regarding the DCAs strategy have been designed the impact of trading investing, fixed asset remain regular over time. It's have no limited to BTC but it can apply to any others investment.