Peculiar world view this. A good chair costs $300, and is tax-deductible. And you can pick one that fits you perfectly. Why are you under the delusion that your co-workers are there to service your query queue ? Figure out how to help yourself. Avoiding interrupting pesky colleagues is a major reason working from home is such a pleasure.

People defend this self-serving behaviour in the name of 'teamwork' and it needs to be called out.