7 months isn't nearly enough time to get an idea of timber regeneration. I don't know what kind of mature pines you have, but remember that pines cast their seeds in the fall and unless there is scarification of the soil when the seeds touch down most of them will be consumed by wildlife. That is probably where the seeds went. Robertesq must have had some prime value timber to have the extra benefits he listed, it isn't common in my area and the cost was probably taken from the stumpage value. I guarantee you don't get all that for free. Southern yellow pine lumberis very low in price now, it set a 25 year low in price a couple of weeks ago.