At least i have ideas to share and you dont have to break this down because you find this personally not a good one, better to support people that share ideas and try to understand what they mean, we all want the same results 
I am not a developer, i am a entrepreneur.
If i have a idea, i share, if its not good, i did share!
If its a good one and would be implemented by someone it will help the community, then you wil not say its not a good idea!
I do like people sharing all ideas.
Why would it be a bad idea?
The tax is now 0.2% so there is no change.
By selling the tax could be higher so people wont sell that easy.
You find this a bad idea, i do not.
When there is actually a drop in zeros and the price is going up, people are willing to sell at 0,5
When it comes to that point a 0 could appear again and by fear others could also sell there Lunc.
At least this could prevent a high selling point by raising a higher tax when zero’s disappear.
This is pure psychological when the price would go up that people could act this way, and when this happens a price drop could be a result, the mass are followers, but when they are taxed more higher to the point Lunc is going closer to 1$ (for example) they could think twice.
When the price is going closer to 1$ or above and there is not a massive selling pressure, people will notice this and could return because of its stability.
It could help to keep the selling pressure lower and if they do sell, a higher volume will be burning.
I don’t say the selling tax should now be that high, i just share my thoughts, i think a progressive Tax could help, keep it cheap to buy, make it a little more expensive to sell.
How to do that, i dont know, i am no developer.
You find this maybe a bad idea, i see potential 