The only way accommodate more attendees and grow would have been to move permanently to a fairground like Leipzig. Unfortunately, there seems to be no willingness to do so. I found the Leipzig events phenomenal and would like to understand the reasons behind this decision, but can only find speculation.. maybe fairgrounds are simply too expensive?
Leipzig’s hotel situation is worse due to having to connect to the fairground outside town. However, due to Leipzigs location at the intersection of two major historic European trade routes (fyi: via imperii and via regia, still has the largest head railway station in Europe), it has much better connections than Hamburg to the rest of Germany and Europe, including Berlin. Also Leipzig (and the fairground itself) have train connections to three airports including BER..