Hey Grub,
It's tough to tell, conversion rates vary wildly among industries. The standard is between 1%-3% with anything below that considered poor and anything above really good. It also varies from company to company and, as you stated, within each marketing channel.
Its good to compare to others in your industry to get a feel for the temperature, but overall you should focus on trends within your own data. If a marketing channels conversion rates are profitable then continue investing in that channel. If the conversion rate isn't high enough to sustain profitability then cut that channel or look for ways to optimize it so it can become profitable.
In the end it doesn't matter how others are performing if your business is profitable and realizing continuous growth.
Hope this helps.
-Jeff
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