Consider the da dice signature campaign on the other hand. If you were to buy a senior account for .3 (there are few sellers that will sell for this little however if you lurk in the digital goods section long enough you will probably be able to find sellers who will sell at this price) then you could buy four low level senior accounts for the same 1.2 btc that you spent on the S5. With the da dice campaign paying .0013 per post up to 100 posts per week, you could make .13 per week per account, or ~.52 per month per senior account. Multiply that times four accounts and you could make roughly 2 btc per month for ~1600 posts. Not only that but you could earn an additional .6 btc per month by winning the most constructive posts contest of .15 per week so your total earnings potential would be 2.68 btc per month from a 1.2 btc investment. Not only that but the value of your accounts should increase over time as they accumulate activity points and potentially rank up to hero status. Your risk however is that making that many posts may result in the temptation to make a lot of shitty posts which would result in your accounts getting banned which would stop your signature campaign revenue. This also obviously does not take into account the value of your time that you spend posting, however if you are interested in bitcoin this might not matter.
Tl;dr signature campaigns.
This looks only good in your description, the reality is a bit different.
-The future of sig campaigns is uncertain. They could disappear just like that and your investment into accounts along with it.
-If you get caught buying a Sr. account you may get negative trust and this will automatically ban you from most campaigns.
-It's not that easy to join a well paid sig campaign with 3 accounts and some campaigns don't even allow it.
-To get that much from Dadice the user would have to write 300 constructive posts a week (1200 a month). You'd have to treat it like a full time job and chances of getting banned would be very high.
-A ban in this case can be compared to all your miners catching fire at the same time
-To get a weekly bonus you'd have to write at least 150 posts each week, so your monthly post count would grow by another 200.