I wouldn't use the phrase "out of line". Brokering has a pretty specific meaning, which is to collect a fee for connecting a buyer and a seller. If you're wholesaling, this is exactly what you're doing because you never have any intention to actually hold the property. Because real estate brokering is a heavily regulated occupation, various techniques are used to avoid actually doing a brokering transaction and falling under the regulations. But those techniques are specifically intended to avoid falling into the legal definition of brokering.
If you're buying a property, fixing it up, and re-selling it, you're engaged in an active business. This is really a manufacturing business. You're buying raw materials (junky houses, materials, and labor) and manufacturing a finished product (a nice house.) This is how the IRS sees it, too. The properties aren't investments, they're inventory. And you're not an investor, but a "dealer" (the IRS term.) A developer also falls into this category.
If you're buying properties to hold as rentals, then you're certainly not brokering the property. In the same way that someone who buys a house, lives in it for five years (or five weeks or five decades) and sells it isn't brokering.
In my opinon, "real estate investing" is buying properties to hold. Wholesaling, fix and flipping, brokering, developing, and property management are all "real estate businesses". You may invest money and time into one of these real estate businesses, but they are active businesses, not passive investments. As if rental real estate is a passive investment.