I don't think it's an unreasonable request after 10 years.

Your direct compensation would cover the effort to bring the deal together and then a management fee for the on-going work.Then you just determine how to split the profit. 50/50 may seem unreasonable if they front all the money and carry all the risk of loss and you're already being compensated for your work.

The seller in my opinion has been unreasonable from start to finish.

But I don't think a $5 hard copy mailed certified would be an unreasonable amount to charge if I was going to go that route. $200 might be a bit too much. 

LESSEE agrees to pay to ionize the premises to remove any unwanted odors.HAZARDOUS ITEMS: LESSEE shall not keep or have on the PREMISES any article or thing of a dangerous, inflammable, or explosive character that might unreasonably increase the danger of fire or that might be considered hazardous by any responsible insurance company.

However after discussing with my realtor I could potentially get a lawyer involved for breach of contract but I decided to sign the termination in the end because the whole situation was a huge headache and he was being completely unreasonable and I wanted to walk away with my dignity and after all this I honestly didn’t want to do business with this knucklehead.

They revel in trying to get you upset especially about something that appears to be trivial and enjoy making you appear unreasonable especially if it enhances their 'victimhood'.

However, some folks spoil the image of cap raisers as whole by misleading investors as to their role or taking an unreasonable split.

Specially, one example is a triplex in great shape and a good area for an asking price of $375,000 and it would only make sense if we could get it for $300,000.I don’t want to waste the time of my agent or anger the sellers by going unreasonably low.

In answer to your original question, it is not unreasonable to pay something on top of commission to a buyer's agent who is helping you buy investment properties, particularly if it's a lower end property.