The only advantage I can see to using a boiler-plate contract would be a small monetary savings.

That said, this might be a very small savings in comparison to the risks. A lot of Real Estate Law and Custom is state specific . . . a boiler plate contract may not be.

Additionally, each deal is unique - there is no such thing as "identical" real estate transactions. One small omission from the contract could spell BIG trouble for you (regardless of which side you are on) if the transaction unravels for any reason. At bare minimum, have a local real estate professional review the contract for you. Better, have a local real estate attorney review  and tweak it. If you are mortgaging the property, the mortgage company may have access to attorneys or title professionals that could offer this service for minimal cost. Where I am in Massachusetts (we use attorneys at all real estate closings here - we are known as an "attorney state"), closing attorneys will often draft a transaction-specific contract for little or nothing if they are otherwise involved in the transaction.

As with any attempt to cut costs . . . evaluate whether the risk you are taking on is really worth the savings gained. I would venture that in this case, it is usually not.