Hi @Zacharias Salva
I'm new here, and this is my first post, so please excuse me for trying to provide any advice with no history to back anything up.
While I would always agree that investing for a positive cash flow is important, it ultimately depends on your situation. Lets say, for example, that you go overseas and do not have any mortgage or rent expense. Now, if you continue to pay the difference on your mortgage payment (minus your rental income) you could still be better off. You have to look at your mortgage principle pay down in your calculations to get the big picture. Assuming you took a 30 year mortgage at around 4% (equating to an $800 payment), over 10 years you would have paid down a little over $35,000 in mortgage principal. While I agree that investing for capital appreciation is a speculative game, it's probably fair to say that over the long term your property valuation will at least stay the same if not increase. So even if it didn't increase and only stayed the same, you would have built $35,000 in equity, that cost you $31,586 out of your own pocket. Not a great return, but it's something. And if you factor in rent increases over the long term, that would be even better.
If you can trim down your expenses as @Roman Pak stated above, you could be pretty close to break even point and at least enjoy principal pay down even if you can't get it to cash flow.
If you sold today for the same as what you paid for it, you are still out of pocket on your closing costs, realtor fees etc. You financed 100% so have no equity.
All I'm saying is, before you sell it and have nothing to show for it, you can at least try to trim your expenses, break even on the cash flow, and build equity on the principal pay down (ignoring appreciation) that you can later use for further investments.