I read in an email on the LibreOffice design list that has been resources allocated to the extensions and templates website for about 25 thousand Euro (from a long time member of the board of The Document Foundation: https://listarchives.libreoffice.org/global/design/msg08869.html). This generates the impression that there has been spent this amount of money to improve the site. But if you look into the accounting legers of The Document Foundation (TDF) (https://wiki.documentfoundation.org/TDF/Ledgers) you will get the real data. TDF spent in 2017 6399,44 Euro and in 2018 642,60 Euro; all in all 7042,04 Euro, which seemed only a bit less than 25 thousand Euro 😉
This TDF resources were used espially to migrate the content of the first LibreOffice extensions and template websites into the new one, for smaller fixes within the code, a professional buildout and maintenance environment and a training of two TDF staff member on the platform and its maintenance (myself wasn’t part of the training session).
The biggest part of the development of the new LibreOffice extensions and templates website was done during my spare time. I tried to save as much as possible expenses for TDF, because I thought it would help to lower the adminstration expenses of TDF and free more money for the promotion of education and science.