Once you're on Methadone for a while, even doubling your dose won't give you that buzz you're looking for. At least that's how it was for me. I'd double my daily dose of 75mg and feel nothing but more mellow.
Methadone is fun for people with relatively low/medium tolerances, but for someone taking it daily it's a waste as far as getting high goes.
Not to mentiom the dangers of randomly doubling your dose as it tends to build up in your body.
I'm trying to research methadone maint./users as to why they feel they are "sober" on dones, why they go long term on this crazy high doses, why they feel this isnt trading one drug for another when it is, etc.
I think a lot of people would be lying if they said they feel absolutely nothing but sober on Methadone. It may not be an intense high, by it is a high of sorts. People dose their Methadone in the AM and then all of the sudden they become more social and chain smoke cigarettes, you know they're getting off to some extent. This is the reason a lot of people prefer Methadone over Suboxone. The mellow and drawn out buzz that's more reminiscent of their DOC than Suboxone.
Why do they go long term on high doses? Because they chase that mellow high. Methadone is like any opiate. They get acquainted with their dose and lose the mild buzz, so they keep increasing their doses into oblivion seeking to at least have some magic in their lives.
However, there are always those who do indeed have ridiculously big habits/fast metabolism and require high doses of Methadone to sustain them. In other words they need the high dose to feel normal and not begin withdrawing before the next dose.
I'm sure every Suboxone/Methadone Maintenance user is aware of the fact that they're trading one drug for another. It's the reason it's called Opiate Replacement Therapy. To some it really is like being clean(there are plenty of people that get no buzz whatsoever out of their maintenance drug) without having to go through withdrawals.
If a hardcore addict with a gigantic habit/tolerance ends up stealing, robbing and scheming to sustain the habit gets on Methadone and becomes a responsible employee/husband/wife/father/mother, it isn't a bad thing. For some people it's the only way to not live a destructive life. No, it's not ideal, but it's better than harming everything/everyone around including yourself.