@Toyin Dawodu Seems like a guru whispered sweet nothings into your ear.
Rental income is passive and tax advantageous. Flipping is not passive and tax disadvantageous.
I don't think you analyzed your rental deals properly which is why you got burned. Further, I have my suspicions that you are analyzing your current deals properly as the example you gave is completely bogus - here's why:
If you are analyzing everything on the gross amount (pre-tax), you are doing yourself a disservice. Let's assume you are in the 25% tax bracket and you also have to pay self-employment tax of 15.3% - your $40k profit is now down to $23,880.
The rental was cash flowing $150/mo, which we will assume is tax free. Where I invest, that gets you a $70k property. Let's assume you 100% financed the property with a rate of 4.5% and term of 30 years. The monthly mortgage payment is $355, but the principal portion of that first payment is actually $92. So really, you are returning $242 per month which bring us down to a total of 98 months (8.2 years) to match $23,880. WOW you were way off dude.
Further, the principle portion of the monthly payment will actually RISE each month. If you throw all of this in a spreadsheet, you will see you actually match your $23,880 in 92 months (7.66 years). This assumes we never increase our monthly cashflow of course.
All that said, I would strongly consider building out solid spreadsheets that help you with the financial analysis of different decisions. This is the type of stuff that can make or break you. If you had to decide to buy/hold vs flip and you saw that the "break-even" was 7.66 years rather than 22 years, you may be jumping for the buy/hold.
**Edit: Additionally, while your time is consumed fixing and flipping a home, the buy and hold guy is networking with private investors and closing more deals...