Well I think it is the normal price. This is One page HTML, doesn’t have blog signle layout which is normal for one page templates to have, so I think this is a fair price..
Your template is priced that way because it is One Page HTML Template, not because of low quality . Nothing to worry about. I think that the maximum price for One page HTML is $12 or $13..
Me and my partner are alao living from Envato earnings. We work really a lot but we love what we do and try to give our best.
Same calculation on our account. FIrst time this happend to us..
Not sure if you’re talking about X Theme, but you can post a comment to authors on this page http://themeforest.net/item/x-the-theme/5871901?WT.ac=search_item&WT.oss_phrase=x%20theme&WT.oss_rank=1&WT.z_author=THEMECO.
Also you can download purchase number by going to your downloads page and click download. There is two options. You can download a theme or licence. Select licence and there will be purchase number. Hope rhis helps .