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I would say with 50-100 high quality products you can certainly reach $200 per month. Probably much more if you have a good niche or sell products that are in demand. I've seen some veterans averaging $6,000 per month (but I don't know what they were selling, they obviously have a good niche).
1 year is a good target to aim for to begin with, just be aware most sales/business works on a linear curve. This means that your first year will probably bring you in less than you expect, but your second, third, fourth year will be much better. If you keep a steady pace (uploading a new product every week or two), I will say you would probably double your income every year as long as you have good descriptions, ratings/feedback, etc.
Also take into consideration the ceiling point. I haven't hit this yet but from reading other artists experience apparently once a model has been on the shelf 5 years its basically hit its ceiling. Software, workflows, designs/trends etc. have changed and thus the product may not sell frequently or at all by that point. My opinion is that you treat a product like that with an upsell - meaning its probably due an update/makeover or combine it into a collection package with some of your items that do sell well. This is basically called upselling, kind of similar to how you get discounts on swimwear in winter.
That's a high quality tip , thank you a lot for the explanation
