i do not think there is anything to debate
first off...if u take into consideration the exchange rate...personally, you are already losing.u will be working and living in SG spending SGD...why are u converting it into RM?
you are not spending RM in SG...it may become a debatable point if you travel everyday across the causeway
but still, exchange rate should not even be taken into consideration.

where you retire is uncertain, so never take that as a factor.
if u earn RM10k, and settle for SGD5k...the amount you get to save does not necessary be more when you convert it back
why not factor the amt you might save if u got a job at SGD9k or even 10k or more?

Uhhhhhhhhhhhhhhhhh mang how can you convert FX and then declare that it's not a downgrade?

If I'm earning rm10k in Malaysia and I come over on sgd5k (27% increase after FX conversion), does that mean I got a good deal?

Previously, I was in bank industry for 1year and 9months. My salary was RM3000 excluded commission.

I got an offer of SGD $2400 now, do u all think is not worth to downgrade? (bt i got EP Q1 and I tot only salary above $3k can get EP)

What do you all think? 
Separately, I am looking for room nearby Aljunied or Potong Pasir.

Currently I am staying with my bro at Clementi, sleep in living room and need to pay $300.

Is expensive and far from my work place. (although is in the same MRT line)

ok...i should rephrase it...if FX as the main or only factor.   
i nvr said one should only accept if it is a 1:1 offer but to take into consideration what other ppl with similar credentials can fetch.
if ur skillset is highly sought after in MY, your pay in numbers will be relatively high...but if u were to move to SG which your skillset is not that hot on the market, your pay in terms of numbers are most likely to take a dip. (i have no idea what kind of skillset  there is with such an example )
that is why...u find out what other ppl with similar skillset as you can fetch.
different field has a different market

for the indon maid case, if the market rate is 3 digit...then they are not losing out.
if market rate is 4 digit and u are taking 3 digit and not on the high side...u are losing out, even if after the conversion, the chunk of money remitted back is a lot.
the question is what if u were to get a job which is around the market rate...instead of way lower compared to the market but higher because of FX
but job searching is a beech...most of the time u need luck.

desperation as u said will be a factor....but how desperate will one go until 50%      (maybe escape from ah long?)
one still has a job (stability aside), one still have some time to bide by....how long is up to each individual
prolonged waiting for an offer can cause frustration and trigger desperation too.

on the 1:1, there will still be people although much lesser...moving has a lot more factors to consider than just FX

Sandcastle building at east coast park...