However, there will most likely be a room full of sophisticated and accredited investors.Do you need passive investors to provide capital for you to help you buy deals in your syndications like @Jay Hinrichs said?

Even the ones that have the most professional set up can still have issues. 

Do you find that it attracts payment compliance and demonstrate professionalism toward your business?

The platform may allow investment by accredited investors only or be open to almost anyoneEach has advantages and disadvantages.The portals that allow anyone to post a deal have not been very successful and they will probably remain a fringe categoryMany investors are familiar with the big players in the industry that provide access to deals sponsored by numerous parties.As an example of a single sponsor platform I will use our own.In the last two years we crowdfunded/syndicated 26 real estate debt deals, raising just over $46,000,000.00 and two months ago completed our first equity raise, raising $1,700,000.00.Additionally, we did a co raise with a major real estate debt crowdfunding portal that was primarily residential and wanted to move into the commercial space.I will tell you that despite many similarities, no two portals operate the same, and there are major differences in deal type, vetting, costs, risks, returns, and transparancy.Keep watching this arena.

@Brenda WilliamsonNot necessarily...If the partnership is throwing off UTBI it's possible the IRA may need to file a 990-T and pay unrelated business income tax.Good question for your tax professional.

The professionalism here in Bigger Pockets has sure gotten my Attention!!!

If the current local property manager charges the same I would get a comparable quote from a professional property management company, to negotiate the price after you have purchased the MHP.

I would like to make the most use of my time in knowing the market and networking with real estate friendly professionals.

Specifically, I'm thinking about issues that will only become visible after an inspection by a professional.

Im unsure of the NY laws as I'm in Missouri, but from my personal and professional experience a good property manager is worth their weight in gold.