Let's look at the math. A 25 TH/s plan cost $3500. In a "few" months you made 0.01 BTC. Let's assume a "few" months is 3. Let's also be generous and price 1 BTC at $800 (It makes the calculations easier). Based on this, you made $8 in 3 months and are projected to make $32 in a year. At that rate it will take 109.375 years to have a positive ROI. Granted, that doesn't take into account projected value of BTC in the future, but it also doesn't take in to effect Bitcoin halvings.

Just for fun... Bitcoin is expected to stop mining around 2140. That gives you 124 years to mine. Assuming you can continue at a rate of 0.01 BTC every three months, that means you will mine just under 5 BTC in that time. Although realistically it will be less than that because of the aforementioned halvings.