Be very wary of those law firms or IP attorneys that charge per class of business.
We understand why they would do this as it takes a bit longer for each application when extra classes are added, and activities need to be identified.
However, in our experience, it doesn’t truly represent the real time involved.
Additionally, it provides a disincentive for clients to get the protection that they need. i.e. if it costs more for extra classes on top of the government fees, then clients are likely not to get the full protection they need.