My advice to people Who are interested in this automation is to get one or two assignment wholesaling deals under your belt or at least five to $10,000 of profitable flips before joining that being said it will give you disposable income to throw in invest into a system in which you can market however if you haven’t made not even one deal at least get one under your belt through you know Facebook channels YouTube craigslist your local tax liens whatever you can do at least get one even if you have to co Wholesale with somebody Truth to the matter is people are in constant search for that get rich quick automation tool where they could have little or no experience and just generate money and that is entirely possible however you need to perfect the craft of marketing or hire somebody who can.

Or would I be ok with another rental and enjoy the income..Would like to know from people who did their own development and was it a game changer to their business profits?

They contribute their equity in the house, you contribute the rehab and split the profit when it sells.   

Profitability varies based on location, seasonality, additional costs, occupancy rates, and reality checks.

Investors want you to earn an income if you are the GC as long as it’s market rates.One structure for land purchase the investors put up all the money for land and house, you do all the work including management and you split all the profits from monthly cashflow 50/50.

I hope that most people here are aware that landlords of commercial properties make huge profits out of installing solar power to their commercial properties.  

EMD in exchange for profits? 

I just don't want to be in a situation where I was not able to maximize the deal, where the seller and buyer potentially makes 50k in profit each, whereas I only get $500, because my initial offer was 'too good to pass up'.

Consider bringing in a partner who can help fund the rehab in exchange for a share of the profits.

Maybe a beginner wholesaler would be cool with something like that.But for us, we wouldn’t partner with an end buyer unless we’re getting a percentage of the profit on the backend, and it has to be a lot more than the wholesale fee for that property.