Irradiation of the tumor bed in early stage breast cancer is a big and good indication for IORT. On the other hand some other alternatives exist, such as SAVI or multi-catheter brachytherapy. Some will also prefer to do external beam partial breast irradiation. Down the road however intraoperative RT may be more appealing to patients, because it's so simple and easy for them.
Right now you would be probably losing money if you were to give IORT to all you early stage breast cancer patients because you would be doing less tangents from them. Looking into 5 years from now, IORT will probably be standard of care for these cases and ASTRO will be saying "Do not deliver WBRT, if you can do PBI". So your patients will be asking for it your competition will probably pick it up.