By going and not contributing money, as some people are proud to announce, you are behaving in a dishonest fashion, accepting the services that they offer without paying for them.
I'm sorry, but you are operating on a false concept of the SSPX (which is merely a branch on the tree of the Catholic Church.)
The Church isn't "paid" for their "services". The priests and bishops that make up the Church hierarchy have a duty to feed the flock -- to offer the Sacraments and preach the Faith. They have to take care of every soul that needs the ministry of the Church -- including the poor, homeless, and penniless.
The Faithful, meanwhile, have a duty to support the Church.
We're not exactly "purchasing" Holy Communion, nor is there a fee for Absolution. There is actually a word for that: Simony.
As long as we're supporting the Church, we are justified in this matter. That can be Fr. Pfeiffer's group or Bishop Williamson, or we can give money directly to our SSPX priest (recommended). We need to show our SSPX priests that they won't starve if they do the right thing and oppose the liberal orientation.
We DON'T need to necessarily put any money in the collection plate, especially since we know now that the organization itself is beginning to rot from the top down.
If you are worried that your particular chapel is in danger of becoming unviable, feel free to do something about it. But most chapels won't miss your contributions. The SSPX has *plenty* of money. Just look at how they're spending it now! Slick websites, ad campaigns,
hiring an expensive branding agency. Spreading propaganda to the four corners of the earth (Fr. Themann's conference, producing propaganda videos starring Fr. Rostand). They're not hurting for money.
And I almost forgot -- building a massive Disneyland seminary (when other, more economical options would do). They seem to be planning for a massive influx from the Novus Ordo. Do they know something we don't -- perhaps a new religious order that's flagellating themselves night and day for conversions? Because if there isn't something like that going on, there's no reason to expect a bunch of TRUE conversions to the Faith/Tradition (which are the same thing).
No, what they're preparing is for an "opening up" to the modern world, Vatican II style. It isn't that a bunch of people are going to suddenly give up contraception, liberalism and embrace tradition -- no, it's the other way around.