True, economic loss was an important factor in the local leaders decisions.
But the Utrecht leaders were pro-French too and not willing to sacrifice farmland for a war they didn't believe in.
In the 1780-1787 uprising much of Utrecht was patriottic and although the hard-core patriots were removed from office in the 1787-88 Stadholder Restauration, the sentiment was very pro-French in 1794. German and especially British troops were treated very badly (and treated the civilians very badly themselves, by the way) and when the French entered the city of Utrecht on January 16, they were recieved with loud cheers... And they were welcomed like that in the entire Republic.
The sentiment is also seen in the fact that the province of Utrecht was the first to surrender to the French, after they proposed a truce, which was refused. Thus Utrecht opened the republic for the French.