By making the software open source you can sneak into enterprises under the management radar. You can make friends among ordinary developers in the enterprise.

By making the software open source you can sneak into enterprises under the management radar. You can make friends among ordinary developers in the enterprise. They can recommend your additional plug-ins, services or whatever you are selling to the management. However, at that point you'll need strong sales department to make the sale actually happen. So, the two options are not alternatives, rather they complement each other. You'll need sales staff in any case. Making the product open source can help the sales staff to sell related products. Whether it's worth it is up to your consideration.