I compare economic costs of small one-man dxpedition against team operation on example of VK9N.
During over 80 days VK9NK (one-man) made more then 42 000 QSOs. Similar result can be achived by group of 5 people during 14 days operation. VK9NK total expenses were 7000 Euro (without expenses for longer unforeseen stay and without cost of equipment).
Team of 5 persons will spent probably about 15000 Euro for 2 weeks. It seems that one-man is about 2 times more effective cost wise.
Few years ago ON4WW wanted to go alone to Bouvet Island for 3 month. I cheered to the echo his project although his goal 100 000 QSOs seems to be too ambitious. Here is his web site: http://www.on4ww.be/bouvet2016.html
Unfortunately amateur radio community did not belive his idea. Instead of supporting his idea big foundations gave big money to team projects that were not successful.
Men think it over!