You're not going to make a whole lot of money unless you put the big bucks in, but I would be very skeptical about doing so.

Let's do the stats...
I invested $25 (£15.48)
I have a current return of $2.70 (£1.36)

Which works out at around 8.79% over 5 days.
Or around 2.16% of compound interest per day.

Which I probably estimate to increase to about $22.46 (£13.91) return by the end of the month.

Not actually that bad considering, but it's not guaranteed, and from my opinion fairly high risk.

But if you've got a spare bob to blow, then you're on the wrong forum.